Practice sketching molecules, using the number of bonds an atom can form as a guide. a. SH2
b. Below is one enantiomer of lactic acid. Draw the other enantiomer. (Remember a pair of enantiomers is two molecules that are mirror images of each other.)

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness